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| HD6437020 Datasheet, PDF (435/507 Pages) Hitachi Semiconductor – SuperH™ RISC engine | |||
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Table 16.2 Select PROM Programming Mode
Pin
Mode
Write
Verify
CE OE
01
00
PGM
0
1
VPP VCC I/O7âI/O0
VPP VCC Data input
Data output
Program inhibit 0 0 0
High impedance
01 1
10 0
11 1
Symbols:
0: Low
1: High
VPP: VPP level
VCC: VCC level
A16âA0
Address input
16.3.2 Write/Verify and Electrical Characteristics
Write/Verify: Write/verify can be accomplished by an efficient high-speed high-reliability
programming system. This system can write data quickly and accurately without placing voltage
stress on the device. The basic flowchart for this high-speed, high-reliability programming system
is shown in figure 16.4.
424 HITACHI
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